Article
Chemistry, Physical
Mengqi Sun, Nicholas Kreis, Kexun Chen, Xiaoqi Fu, Song Guo, Hui Wang
Summary: Copper sulfide nanoparticles can be synthesized with tunable geometric parameters and chemical compositions to modify their optical and plasmonic properties. The study demonstrates a temperature-programmed synthetic approach to produce monolithic covellite nanodisks with controllable thickness and lateral diameters, expanding their plasmonic tunability across different infrared ranges. Additionally, the transformation of covellite nanodisks into multicrystalline digenite nanorings through a phase-transitioning process leads to modified plasmonic properties and energy shifts of the nanoparticles.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Analytical
Pengkun Chen, Xinyi Chen, Mingyu Cheng, Chuting Zhang, Jin Cui, Bin Ai
Summary: Hollow nanocone arrays were fabricated using a low-cost and efficient colloidal lithography technique. The optical properties of the obverse and inverse arrays were determined by the surrounding environment, showing different reflection spectra and structure dependence. The inverse arrays exhibited high refractive index sensitivity and could enhance fluorescence without quenching effects.
Review
Chemistry, Multidisciplinary
Quynh N. Nguyen, Chenxiao Wang, Yuxin Shang, Annemieke Janssen, Younan Xia
Summary: This Review provides an account of recent progress in understanding and controlling asymmetrical growth and symmetry breaking in colloidal synthesis of noble-metal nanocrystals. The article discusses methods capable of generating seeds with diverse symmetry and achieving asymmetrical growth for mono-, bi-, and multimetallic systems. Various symmetry-broken nanocrystals are showcased, along with insights into their growth mechanisms. The properties and applications of these nanocrystals are highlighted, and future directions in developing this class of nanomaterials are discussed.
Review
Chemistry, Multidisciplinary
Quynh N. Nguyen, Chenxiao Wang, Yuxin Shang, Annemieke Janssen, Younan Xia
Summary: Nanocrystals offer a unique platform for enhancing the performance of solid materials in various applications. Asymmetrical growth and symmetry breaking provide a powerful approach to enrich metal nanocrystals with new shapes, complex morphologies, and unprecedented properties. This Review summarizes recent progress in understanding and controlling asymmetrical growth and symmetry breaking in the colloidal synthesis of noble-metal nanocrystals. It discusses methods for generating seeds with diverse symmetry and achieving asymmetrical growth, showcases symmetry-broken nanocrystals, and highlights their growth mechanisms, properties, and applications. Future directions in developing this class of nanomaterials are also discussed.
Article
Chemistry, Multidisciplinary
Olena Khoruzhenko, Volodymyr Dudko, Sabine Rosenfeldt, Josef Breu
Summary: Metamaterials, possessing unique properties not found in nature, have become a popular subject of research and engineering. This paper presents an effective method to produce metasurfaces with a combination of optical and thermal properties. The method utilizes liquid crystalline suspensions of nanosheets coated onto various substrates, allowing for efficient conversion of sunlight into heat. This scalable and affordable wet colloidal processing technique offers a new way to create metamaterials without high vacuum or lithographic techniques.
MATERIALS HORIZONS
(2023)
Article
Chemistry, Physical
Jieun Shin, Sungwoo Lee, Sungjae Yoo, Insub Jung, Soohyun Lee, Jeongwon Kim, Jiwoong Son, Ji-Eun Kim, Jae-Myoung Kim, Jwa-Min Nam, Sungho Park
Summary: To enhance the near-field focusing around nanoscale metal particles, we designed large-sized gold double nanorings with nanoscale gaps between them. These gaps resemble hot halos where single-particle surface-enhanced Raman scattering occurs. The synthesis of these gold nanohalos was achieved using a novel strategy based on hexagonal gold nanoplates as templates. The resulting nanohalos exhibited near-field focusing, confirmed by both experimental measurements and theoretical simulation. The study also revealed a correlation between the distances of intra-nanogaps and particle sizes of gold nanohalos on single-particle surface-enhanced Raman scattering, with high enhancement factors and reproducibility.
CHEMISTRY OF MATERIALS
(2022)
Article
Engineering, Multidisciplinary
Yueqiang Hu, Ling Li, Rong Wang, Jian Song, Hongdong Wang, Huigao Duan, Jiaxin Ji, Yonggang Meng
Summary: A parallel plasmonic direct-writing nanolithography system has been established to achieve a minimum flying height of around 15 nm with high parallelism at a rotating speed of 8-18 m/s. Additionally, a multi-stage metasurface-based polarization insensitive plasmonic lens is proposed to couple more power and realize more confined spot compared to conventional plasmonic lenses. The prototyping system enables parallel lithography of nanostructures with the smallest linewidth around 26 nm.
Article
Chemistry, Physical
Pengwei Li, Hongfang Wang, Zulhumar Turup, Xiaoyu Yang, Jingyu Wang, Min Gao
Summary: Efficiently manipulating plasmonic modes by adjusting geometry, spatial arrangement, and the nature of the material has shown great potential in ultrasensitive sensing, optical modulation, and surface-enhanced spectroscopy. Symmetry breaking as an effective geometry-controlled method can induce plasmonic hybridization and further tune resonant wavelength, strength, and electromagnetic fields. Theoretical design of a symmetry-breaking Ag nano-cube with an introduced cavity along the lateral edges allows for arbitrary tuning of plasmonic modes based on plasmon hybridization theory. This research provides insight into the mechanism of light-matter interactions and paves the way for efficient nanophotonic platforms in plasmon-enhanced spectroscopy and optical wave manipulations.
APPLIED SURFACE SCIENCE
(2023)
Article
Biochemistry & Molecular Biology
Feng Xu, Zhiliang Zhang, Jun Ma, Churong Ma, Bai-Ou Guan, Kai Chen
Summary: Reliable gas sensors are crucial for hydrogen gas detection and storage. In this study, large-area Pd nanostructures were fabricated, and their H-2 sensing performance was systematically studied. The results showed clear transmittance changes in the visible-near infrared range for both Pd nanoholes and nanotriangles after hydrogen absorption.
Article
Chemistry, Multidisciplinary
Rino Kaneko, Hiroto Ichikawa, Marika Hosaka, Yoshihiro Sone, Yoshiro Imura, Ke-Hsuan Wang, Takeshi Kawai
Summary: In this study, colloidal photolithography was used to fabricate periodic hole structures on polystyrene films. Non-spherical holes were also created by adjusting the UV illumination conditions. Additionally, convex patterns were achieved by combining weak UV illumination with solvent treatment. The study also demonstrated the deposition of periodic silver nanoparticle spots on polystyrene films by dissolving silver ions in water.
Article
Chemistry, Multidisciplinary
Rino Kaneko, Hiroto Ichikawa, Marika Hosaka, Yoshihiro Sone, Yoshiro Imura, Ke-Hsuan Wang, Takeshi Kawai
Summary: Colloidal photolithography is an advanced technique for fabricating periodic nanopatterned arrays. In this study, the technique is applied to polystyrene films to create hole structures, convex patterns, and periodic silver nanoparticle spots.
Article
Chemistry, Multidisciplinary
Jichuan Qiu, Zitao Chen, Miaofang Chi, Younan Xia
Summary: A versatile route to the fabrication of well-controlled Janus particles by breaking the symmetry of spherical particles with swelling is reported. Janus particles are comprised of two distinct components: one made of PS and the other comprised of a rigid shell and remaining PS. This solution-based route holds promise for scalable production of complex Janus particles with a variety of compositions and in large quantities.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Nanoscience & Nanotechnology
Jose M. Viana, Manuel Romero, Gabriel Lozano, Hernan Miguez
Summary: This study demonstrates that metallic nanostructures prepared by colloidal lithography can enhance the brightness of nanophosphor emissions, providing an economical nanophotonic solution for developing bright emitting coatings.
ACS APPLIED NANO MATERIALS
(2022)
Article
Materials Science, Coatings & Films
MaCayla J. Caso, Michael G. Benton, Kevin M. McPeak
Summary: Colloidal lithography (CL) is a promising method for large-scale fabrication of nanohole and nanodot arrays with various applications. Tilt-rotate evaporation colloidal lithography (TRE-CL) overcomes the trade-off between hole diameter and polydispersity, allowing for higher pitch-to-hole-diameter ratios and smaller hole sizes while maintaining low coefficient of variation and good hole circularity.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Chemistry, Multidisciplinary
Daniel Darvill, Marzia Iarossi, Ricardo M. Abraham Ekeroth, Aliaksandr Hubarevich, Jian-An Huang, Francesco De Angelis
Summary: A novel anisotropic process called plasma etching induced by temperature gradients (PE-TG) is reported, which is used to modify the 3D morphology of a polystyrene sphere array to obtain ordered nano mushroom arrays. The method allows easy tuning of mushroom features and can serve as templates for fabricating plasmonic structures for various applications like molecular sensing and SERS.
NANOSCALE ADVANCES
(2021)
Correction
Optics
Kai Yao, Siqi Li, Zhiliang Liu, Yiran Ying, Petr Dvorak, Linfeng Fei, Tomas Sikola, Haitao Huang, Peter Nordlander, Alex K. -Y. Jen, Dangyuan Lei
LIGHT-SCIENCE & APPLICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Aaron Bayles, Shu Tian, Jingyi Zhou, Lin Yuan, Yigao Yuan, Christian R. Jacobson, Corbin Farr, Ming Zhang, Dayne F. Swearer, David Solti, Minghe Lou, Henry O. Everitt, Peter Nordlander, Naomi J. Halas
Summary: This study introduces Al@TiO2 core-shell nanoparticles as active photocatalysts for hot electron-mediated H-2 dissociation reaction and hot hole-mediated methanol dehydration. The research indicates that the photocatalytic mechanism involves plasmonic hot carrier generation and subsequent transfer into the TiO2 layer. The Al@TiO2 antenna-reactor offers an earth-abundant solution for the future design of visible-light-driven plasmonic photocatalysts.
Editorial Material
Chemistry, Multidisciplinary
Nicholas A. Kotov, Deji Akinwande, C. Jeffrey Brinker, Jillian M. Buriak, Warren C. W. Chan, Xiaodong Chen, Manish Chhowalla, William Chueh, Sharon C. Glotzer, Yury Gogotsi, Mark C. Hersam, Dean Ho, Tony Hu, Ali Javey, Cherie R. Kagan, Kazunori Kataoka, Il-Doo Kim, Shuit-Tong Lee, Young Hee Lee, Luis M. Liz-Marzan, Jill E. Millstone, Paul Mulvaney, Andre E. Nel, Peter Nordlander, Wolfgang J. Parak, Reginald M. Penner, Andrey L. Rogach, Mathieu Salanne, Raymond E. Schaak, Ajay K. Sood, Molly Stevens, Vladimir Tsukruk, Andrew T. S. Wee, Ilja Voets, Tanja Weil, Paul S. Weiss
Article
Multidisciplinary Sciences
Ming Lun Tseng, Michael Semmlinger, Ming Zhang, Catherine Arndt, Tzu-Ting Huang, Jian Yang, Hsin Yu Kuo, Vin-Cent Su, Mu Ku Chen, Cheng Hung Chu, Benjamin Cerjan, Din Ping Tsai, Peter Nordlander, Naomi J. Halas
Summary: A metalens that can generate and focus VUV light simultaneously has been successfully created by the research team. The metalens is ultracompact and phase-matching free, making it a useful tool for developing low-loss VUV components and increasing the accessibility of VUV light.
Letter
Chemistry, Physical
Hossein Robatjazi, Andrea Schirato, Alessandro Alabastri, Phillip Christopher, Emily A. Carter, Peter Nordlander, Naomi J. Halas
Article
Chemistry, Physical
Lin Yuan, Anvy Kuriakose, Jingyi Zhou, Hossein Robatjazi, Peter Nordlander, Naomi J. Halas
Summary: In this study, a n-TiO2 / aluminum (Al) nanodisk/p-GaN photoelectrode sandwich device was reported, which exhibited enhanced H2 generation efficiencies due to a combination of plasmon-enhanced processes. Hot electrons generated in the illuminated Al nanodisk were injected into the conduction band of the TiO2 layer, driving H2 evolution by transferring into water molecules adsorbed on the TiO2 surface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Christian R. Jacobson, Gang Wu, Lawrence B. Alemany, Gopal Narmada Naidu, Minhan Lou, Yigao Yuan, Aaron Bayles, Benjamin D. Clark, Yukun Cheng, Arzeena Ali, Ah-Lim Tsai, Ian A. Tonks, Peter Nordlander, Naomi J. Halas
Summary: This study introduces a dual catalyst approach for the synthesis of Al nanocrystals, allowing control over both size and shape. By using two catalysts with different functions, precise control over the size and shape of the resulting Al nanocrystals can be achieved.
Article
Nanoscience & Nanotechnology
Benjamin Cerjan, Burak Gerislioglu, Stephan Link, Peter Nordlander, Naomi J. Halas, Mark Griep
Summary: This study focuses on the importance of meta-atom design in plasmonic metasurfaces, particularly in aspects like visible coloration and Fano resonances, and discusses their potential applications in the sensing field.
Article
Multidisciplinary Sciences
Yara Kadria-Vili, Oara Neumann, Yage Zhao, Peter Nordlander, Gary Martinez, James A. Bankson, Naomi J. Halas
Summary: A promising clinical trial using gold-silica core-shell nanostructures for near-infrared photothermal therapy of prostate cancer has been reported. In this study, PEGylated Gd2O3-mesoporous silica/gold core/shell nanoparticles were synthesized, which not only have near-infrared photothermal properties but also provide sufficient MRI contrast for visualization at therapeutic doses.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Parmeet Dhindsa, David Solti, Christian R. Jacobson, Anvy Kuriakose, Gopal Narmada Naidu, Aaron Bayles, Yigao Yuan, Peter Nordlander, Naomi J. Halas
Summary: This study provides direct insight into the role of catalyst molecular structure in controlling the morphology of aluminum nanocrystals (Al NCs) by systematically modifying the catalyst molecular structure.
Article
Multidisciplinary Sciences
Mary M. Bajomo, Yilong Ju, Jingyi Zhou, Simina Elefterescu, Corbin Farr, Yiping Zhao, Oara Neumann, Peter Nordlander, Ankit Patel, Naomi J. Halas
Summary: The combination of surface-enhanced Raman spectroscopy (SERS) with machine learning (ML) shows promise in detecting and identifying priority pollutants in complex multicomponent mixtures. By using an unsupervised ML algorithm, characteristic SERS peaks of unknown components can be extracted from the spectra and identified against a spectral library.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Multidisciplinary Sciences
Yigao Yuan, Linan Zhou, Hossein Robatjazi, Junwei Lucas Bao, Jingyi Zhou, Aaron Bayles, Lin Yuan, Minghe Lou, Minhan Lou, Suman Khatiwada, Emily A. Carter, Peter Nordlander, Naomi J. Halas
Summary: Plasmonic photocatalysis can transform a thermally unreactive transition metal into a catalytically active site, achieving efficient photocatalytic decomposition of ammonia.
Article
Chemistry, Multidisciplinary
Mirko Vanzan, Gabriel Gil, Davide Castaldo, Peter Nordlander, Stefano Corni
Summary: Hot electron photocatalysis is a fascinating field with great technological potential. However, the mechanisms behind it are not fully understood. In this study, we propose a mechanism based on transient electron spillover and energy release into vibrational modes. Using real-time Time Dependent Density Functional Theory, we simulate the dynamics of hot electrons moving on chains of Ag or Au atoms with different adsorbates. Our results show that specific modes are selectively activated, and the energy transfer depends on the adsorbate, metal, and hot electron energy. This mechanism could play a significant role in hot electron photocatalysis.
Article
Chemistry, Multidisciplinary
Yilong Ju, Oara Neumann, Mary Bajomo, Yiping Zhao, Peter Nordlander, Naomi J. Halas, Ankit Patel
Summary: This article presents a machine learning algorithm that can identify chemicals by matching their SERS spectra to a standard Raman spectral library. The algorithm uses a facial recognition-like approach for spectral recognition and quantifies the degree of similarity to a Raman spectrum using a metric called Characteristic Peak Similarity (CaPSim). The analysis shows that CaPSim outperforms existing spectral matching algorithms in terms of accuracy. This machine learning-based approach could greatly facilitate the spectroscopic identification of molecules in fieldable SERS applications.
Article
Multidisciplinary Sciences
Luke Henderson, Oara Neumann, Yara Kadria-Vili, Burak Gerislioglu, James Bankson, Peter Nordlander, Naomi J. Halas
Summary: This study reports a novel nanoparticle Gd2O3-NM, which is a multilayered nanoparticle structure capable of both magnetic resonance imaging (MRI) and photothermal therapy (PTT). Gd2O3-NM exhibits excellent stability and imaging performance, providing a new option for tumor treatment and diagnosis.